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<div class="title">/data/users/hoss/faiss/ProductQuantizer.cpp</div>  </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) Facebook, Inc. and its affiliates.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * This source code is licensed under the MIT license found in the</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;</div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// -*- c++ -*-</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;</div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#include &quot;ProductQuantizer.h&quot;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;</div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;</div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;cstddef&gt;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;cstring&gt;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;cstdio&gt;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &lt;memory&gt;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &quot;FaissAssert.h&quot;</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#include &quot;VectorTransform.h&quot;</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#include &quot;IndexFlat.h&quot;</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#include &quot;utils.h&quot;</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">/* declare BLAS functions, see http://www.netlib.org/clapack/cblas/ */</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="keywordtype">int</span> sgemm_ (<span class="keyword">const</span> <span class="keywordtype">char</span> *transa, <span class="keyword">const</span> <span class="keywordtype">char</span> *transb, FINTEGER *m, FINTEGER *</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;            n, FINTEGER *k, <span class="keyword">const</span> <span class="keywordtype">float</span> *alpha, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;            FINTEGER *lda, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, FINTEGER *</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;            ldb, <span class="keywordtype">float</span> *beta, <span class="keywordtype">float</span> *c, FINTEGER *ldc);</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;}</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="keyword">namespace </span>faiss {</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">/* compute an estimator using look-up tables for typical values of M */</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> CT, <span class="keyword">class</span> C&gt;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="keywordtype">void</span> pq_estimators_from_tables_Mmul4 (<span class="keywordtype">int</span> M, <span class="keyword">const</span> CT * codes,</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;                                      <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;                                      <span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict dis_table,</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;                                      <span class="keywordtype">size_t</span> ksub,</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;                                      <span class="keywordtype">size_t</span> k,</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                                      <span class="keywordtype">float</span> * heap_dis,</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;                                      <span class="keywordtype">long</span> * heap_ids)</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;{</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j &lt; ncodes; j++) {</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;        <span class="keywordtype">float</span> dis = 0;</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span> *dt = dis_table;</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m &lt; M; m+=4) {</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;            <span class="keywordtype">float</span> dism = 0;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;            dism  = dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;            dism += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;            dism += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;            dism += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;            dis += dism;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        }</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        <span class="keywordflow">if</span> (C::cmp (heap_dis[0], dis)) {</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;            heap_pop&lt;C&gt; (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;            heap_push&lt;C&gt; (k, heap_dis, heap_ids, dis, j);</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;        }</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    }</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;}</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> CT, <span class="keyword">class</span> C&gt;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="keywordtype">void</span> pq_estimators_from_tables_M4 (<span class="keyword">const</span> CT * codes,</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;                                   <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;                                   <span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict dis_table,</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;                                   <span class="keywordtype">size_t</span> ksub,</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;                                   <span class="keywordtype">size_t</span> k,</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;                                   <span class="keywordtype">float</span> * heap_dis,</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;                                   <span class="keywordtype">long</span> * heap_ids)</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;{</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j &lt; ncodes; j++) {</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;        <span class="keywordtype">float</span> dis = 0;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span> *dt = dis_table;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        dis  = dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;        dis += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;        dis += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        dis += dt[*codes++];</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;        <span class="keywordflow">if</span> (C::cmp (heap_dis[0], dis)) {</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;            heap_pop&lt;C&gt; (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;            heap_push&lt;C&gt; (k, heap_dis, heap_ids, dis, j);</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;        }</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    }</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;}</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> CT, <span class="keyword">class</span> C&gt;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> pq_estimators_from_tables (<span class="keyword">const</span> ProductQuantizer&amp; pq,</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;                                              <span class="keyword">const</span> CT * codes,</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;                                              <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;                                              <span class="keyword">const</span> <span class="keywordtype">float</span> * dis_table,</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;                                              <span class="keywordtype">size_t</span> k,</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;                                              <span class="keywordtype">float</span> * heap_dis,</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;                                              <span class="keywordtype">long</span> * heap_ids)</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;{</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    <span class="keywordflow">if</span> (pq.M == 4)  {</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;        pq_estimators_from_tables_M4&lt;CT, C&gt; (codes, ncodes,</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;                                             dis_table, pq.ksub, k,</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;                                             heap_dis, heap_ids);</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;        <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    }</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    <span class="keywordflow">if</span> (pq.M % 4 == 0) {</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;        pq_estimators_from_tables_Mmul4&lt;CT, C&gt; (pq.M, codes, ncodes,</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;                                                dis_table, pq.ksub, k,</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;                                                heap_dis, heap_ids);</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;        <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    }</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    <span class="comment">/* Default is relatively slow */</span></div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">size_t</span> M = pq.M;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">size_t</span> ksub = pq.ksub;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j &lt; ncodes; j++) {</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;        <span class="keywordtype">float</span> dis = 0;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict dt = dis_table;</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m &lt; M; m++) {</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;            dis += dt[*codes++];</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;            dt += ksub;</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;        }</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;        <span class="keywordflow">if</span> (C::cmp (heap_dis[0], dis)) {</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;            heap_pop&lt;C&gt; (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;            heap_push&lt;C&gt; (k, heap_dis, heap_ids, dis, j);</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;        }</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    }</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;}</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> C&gt;</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> pq_estimators_from_tables_generic(<span class="keyword">const</span> ProductQuantizer&amp; pq,</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;                                                     <span class="keywordtype">size_t</span> nbits,</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;                                                     <span class="keyword">const</span> uint8_t *codes,</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;                                                     <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;                                                     <span class="keyword">const</span> <span class="keywordtype">float</span> *dis_table,</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;                                                     <span class="keywordtype">size_t</span> k,</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;                                                     <span class="keywordtype">float</span> *heap_dis,</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;                                                     <span class="keywordtype">long</span> *heap_ids)</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;{</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;  <span class="keyword">const</span> <span class="keywordtype">size_t</span> M = pq.M;</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;  <span class="keyword">const</span> <span class="keywordtype">size_t</span> ksub = pq.ksub;</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j &lt; ncodes; ++j) {</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    <a class="code" href="structfaiss_1_1ProductQuantizer_1_1PQDecoderGeneric.html">faiss::ProductQuantizer::PQDecoderGeneric</a> decoder(</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;      codes + j * pq.code_size, nbits</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    );</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;    <span class="keywordtype">float</span> dis = 0;</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict dt = dis_table;</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m &lt; M; m++) {</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;      uint64_t c = decoder.decode();</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;      dis += dt[c];</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;      dt += ksub;</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    }</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    <span class="keywordflow">if</span> (C::cmp(heap_dis[0], dis)) {</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;      heap_pop&lt;C&gt;(k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;      heap_push&lt;C&gt;(k, heap_dis, heap_ids, dis, j);</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;    }</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;  }</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;}</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;<span class="comment">/*********************************************</span></div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;<span class="comment"> * PQ implementation</span></div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;<span class="comment"> *********************************************/</span></div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;ProductQuantizer::ProductQuantizer (<span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> M, <span class="keywordtype">size_t</span> nbits):</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;    d(d), M(M), nbits(nbits), assign_index(nullptr)</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;{</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;    set_derived_values ();</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;}</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;ProductQuantizer::ProductQuantizer ()</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;    : ProductQuantizer(0, 1, 0) {}</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;</div>
<div class="line"><a name="l00187"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#ab3067f333b26811537a8519fb08292ce">  187</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#ab3067f333b26811537a8519fb08292ce">ProductQuantizer::set_derived_values</a> () {</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;    <span class="comment">// quite a few derived values</span></div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;    FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a> % M == 0);</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;    <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a> = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a> / <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>;</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;    <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a> = (nbits * M + 7) / 8;</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;    ksub = 1 &lt;&lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">nbits</a>;</div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;    <a class="code" href="structfaiss_1_1ProductQuantizer.html#aab1109a29ba0544358e274d727b23cae">centroids</a>.resize (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a> * ksub);</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;    <a class="code" href="structfaiss_1_1ProductQuantizer.html#a1e4056fa3938ed8c9fe701e90d94ad95">verbose</a> = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;    train_type = Train_default;</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;}</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;</div>
<div class="line"><a name="l00198"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775">  198</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775">ProductQuantizer::set_params</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * centroids_, <span class="keywordtype">int</span> m)</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;{</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;  memcpy (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, 0), centroids_,</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;            ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a> * <span class="keyword">sizeof</span> (centroids_[0]));</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;}</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;<span class="keyword">static</span> <span class="keywordtype">void</span> init_hypercube (<span class="keywordtype">int</span> d, <span class="keywordtype">int</span> nbits,</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;                            <span class="keywordtype">int</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;                            <span class="keywordtype">float</span> *centroids)</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;{</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;    std::vector&lt;float&gt; mean (d);</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; n; i++)</div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; d; j++)</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;            mean [j] += x[i * d + j];</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;    <span class="keywordtype">float</span> maxm = 0;</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; d; j++) {</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;        mean [j] /= n;</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;        <span class="keywordflow">if</span> (fabs(mean[j]) &gt; maxm) maxm = fabs(mean[j]);</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;    }</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; (1 &lt;&lt; nbits); i++) {</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;        <span class="keywordtype">float</span> * cent = centroids + i * d;</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; nbits; j++)</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;            cent[j] = mean [j] + (((i &gt;&gt; j) &amp; 1) ? 1 : -1) * maxm;</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = nbits; j &lt; d; j++)</div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;            cent[j] = mean [j];</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;    }</div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;}</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;<span class="keyword">static</span> <span class="keywordtype">void</span> init_hypercube_pca (<span class="keywordtype">int</span> d, <span class="keywordtype">int</span> nbits,</div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;                                <span class="keywordtype">int</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;                                <span class="keywordtype">float</span> *centroids)</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;{</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;    PCAMatrix pca (d, nbits);</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;    pca.train (n, x);</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; (1 &lt;&lt; nbits); i++) {</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;        <span class="keywordtype">float</span> * cent = centroids + i * d;</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; d; j++) {</div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;            cent[j] = pca.mean[j];</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;            <span class="keywordtype">float</span> f = 1.0;</div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> k = 0; k &lt; nbits; k++)</div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;                cent[j] += f *</div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;                    sqrt (pca.eigenvalues [k]) *</div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;                    (((i &gt;&gt; k) &amp; 1) ? 1 : -1) *</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;                    pca.PCAMat [j + k * d];</div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;        }</div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;    }</div>
<div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;</div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;}</div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;</div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;<span class="keywordtype">void</span> ProductQuantizer::train (<span class="keywordtype">int</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> * x)</div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;{</div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;    <span class="keywordflow">if</span> (train_type != <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35aa1aefc6c08f0ca974de9f59d9557aa0d">Train_shared</a>) {</div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;        <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35">train_type_t</a> final_train_type;</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;        final_train_type = train_type;</div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;        <span class="keywordflow">if</span> (train_type == <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35ac8040c8792a014a2ea7188583575013e">Train_hypercube</a> ||</div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;            train_type == <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a6b330bc2cfa02a402d002d657f214931">Train_hypercube_pca</a>) {</div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;            <span class="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a> &lt; nbits) {</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;                final_train_type = Train_default;</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;                printf (<span class="stringliteral">&quot;cannot train hypercube: nbits=%ld &gt; log2(d=%ld)\n&quot;</span>,</div>
<div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;                        nbits, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>);</div>
<div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;            }</div>
<div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;        }</div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;</div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;        <span class="keywordtype">float</span> * xslice = <span class="keyword">new</span> <span class="keywordtype">float</span>[n * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>];</div>
<div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;        ScopeDeleter&lt;float&gt; del (xslice);</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; n; j++)</div>
<div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;                memcpy (xslice + j * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>,</div>
<div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;                        x + j * d + m * dsub,</div>
<div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;                        dsub * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;</div>
<div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;            Clustering clus (dsub, ksub, <a class="code" href="structfaiss_1_1ProductQuantizer.html#af265acf5aa1bcda60898002287e6a3d6">cp</a>);</div>
<div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;</div>
<div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;            <span class="comment">// we have some initialization for the centroids</span></div>
<div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;            <span class="keywordflow">if</span> (final_train_type != Train_default) {</div>
<div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;                clus.centroids.resize (dsub * ksub);</div>
<div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;            }</div>
<div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;</div>
<div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;            <span class="keywordflow">switch</span> (final_train_type) {</div>
<div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;            <span class="keywordflow">case</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35ac8040c8792a014a2ea7188583575013e">Train_hypercube</a>:</div>
<div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;                init_hypercube (dsub, nbits, n, xslice,</div>
<div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;                                clus.centroids.data ());</div>
<div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;                <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;            <span class="keywordflow">case</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a6b330bc2cfa02a402d002d657f214931">Train_hypercube_pca</a>:</div>
<div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;                init_hypercube_pca (dsub, nbits, n, xslice,</div>
<div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;                                    clus.centroids.data ());</div>
<div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;                <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;            <span class="keywordflow">case</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a4960d143d2aa49cf92028cf3470c47a0">Train_hot_start</a>:</div>
<div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;                memcpy (clus.centroids.data(),</div>
<div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;                        <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a> (m, 0),</div>
<div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;                        dsub * ksub * <span class="keyword">sizeof</span> (float));</div>
<div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;                <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;            <span class="keywordflow">default</span>: ;</div>
<div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;            }</div>
<div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;</div>
<div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;            <span class="keywordflow">if</span>(<a class="code" href="structfaiss_1_1ProductQuantizer.html#a1e4056fa3938ed8c9fe701e90d94ad95">verbose</a>) {</div>
<div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;                clus.verbose = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160;                printf (<span class="stringliteral">&quot;Training PQ slice %d/%zd\n&quot;</span>, m, M);</div>
<div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160;            }</div>
<div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;            IndexFlatL2 index (dsub);</div>
<div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;            clus.train (n, xslice, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a> ? *<a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a> : index);</div>
<div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;            <a class="code" href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775">set_params</a> (clus.centroids.data(), m);</div>
<div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;        }</div>
<div class="line"><a name="l00309"></a><span class="lineno">  309</span>&#160;</div>
<div class="line"><a name="l00310"></a><span class="lineno">  310</span>&#160;</div>
<div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;</div>
<div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;        Clustering clus (dsub, ksub, <a class="code" href="structfaiss_1_1ProductQuantizer.html#af265acf5aa1bcda60898002287e6a3d6">cp</a>);</div>
<div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;</div>
<div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;        <span class="keywordflow">if</span>(<a class="code" href="structfaiss_1_1ProductQuantizer.html#a1e4056fa3938ed8c9fe701e90d94ad95">verbose</a>) {</div>
<div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;            clus.verbose = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;            printf (<span class="stringliteral">&quot;Training all PQ slices at once\n&quot;</span>);</div>
<div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;        }</div>
<div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;</div>
<div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160;        IndexFlatL2 index (dsub);</div>
<div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;</div>
<div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;        clus.train (n * M, x, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a> ? *<a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a> : index);</div>
<div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;            <a class="code" href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775">set_params</a> (clus.centroids.data(), m);</div>
<div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;        }</div>
<div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;</div>
<div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;    }</div>
<div class="line"><a name="l00328"></a><span class="lineno">  328</span>&#160;}</div>
<div class="line"><a name="l00329"></a><span class="lineno">  329</span>&#160;</div>
<div class="line"><a name="l00330"></a><span class="lineno">  330</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">class</span> PQEncoder&gt;</div>
<div class="line"><a name="l00331"></a><span class="lineno">  331</span>&#160;<span class="keywordtype">void</span> compute_code(<span class="keyword">const</span> ProductQuantizer&amp; pq, <span class="keyword">const</span> <span class="keywordtype">float</span> *x, uint8_t *code) {</div>
<div class="line"><a name="l00332"></a><span class="lineno">  332</span>&#160;  <span class="keywordtype">float</span> distances [pq.ksub];</div>
<div class="line"><a name="l00333"></a><span class="lineno">  333</span>&#160;  PQEncoder encoder(code, pq.nbits);</div>
<div class="line"><a name="l00334"></a><span class="lineno">  334</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m &lt; pq.M; m++) {</div>
<div class="line"><a name="l00335"></a><span class="lineno">  335</span>&#160;    <span class="keywordtype">float</span> mindis = 1e20;</div>
<div class="line"><a name="l00336"></a><span class="lineno">  336</span>&#160;    uint64_t idxm = 0;</div>
<div class="line"><a name="l00337"></a><span class="lineno">  337</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">float</span> * xsub = x + m * pq.dsub;</div>
<div class="line"><a name="l00338"></a><span class="lineno">  338</span>&#160;</div>
<div class="line"><a name="l00339"></a><span class="lineno">  339</span>&#160;    fvec_L2sqr_ny(distances, xsub, pq.get_centroids(m, 0), pq.dsub, pq.ksub);</div>
<div class="line"><a name="l00340"></a><span class="lineno">  340</span>&#160;</div>
<div class="line"><a name="l00341"></a><span class="lineno">  341</span>&#160;    <span class="comment">/* Find best centroid */</span></div>
<div class="line"><a name="l00342"></a><span class="lineno">  342</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; pq.ksub; i++) {</div>
<div class="line"><a name="l00343"></a><span class="lineno">  343</span>&#160;      <span class="keywordtype">float</span> dis = distances[i];</div>
<div class="line"><a name="l00344"></a><span class="lineno">  344</span>&#160;      <span class="keywordflow">if</span> (dis &lt; mindis) {</div>
<div class="line"><a name="l00345"></a><span class="lineno">  345</span>&#160;        mindis = dis;</div>
<div class="line"><a name="l00346"></a><span class="lineno">  346</span>&#160;        idxm = i;</div>
<div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;      }</div>
<div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160;    }</div>
<div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;</div>
<div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;    encoder.encode(idxm);</div>
<div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;  }</div>
<div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160;}</div>
<div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;</div>
<div class="line"><a name="l00354"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a08b130e3a21f2699a4e3bbec121fb838">  354</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a08b130e3a21f2699a4e3bbec121fb838">ProductQuantizer::compute_code</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> * x, uint8_t * code)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;  <span class="keywordflow">switch</span> (nbits) {</div>
<div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;    <span class="keywordflow">case</span> 8:</div>
<div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;      faiss::compute_code&lt;PQEncoder8&gt;(*<span class="keyword">this</span>, x, code);</div>
<div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;      <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00359"></a><span class="lineno">  359</span>&#160;</div>
<div class="line"><a name="l00360"></a><span class="lineno">  360</span>&#160;    <span class="keywordflow">case</span> 16:</div>
<div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160;      faiss::compute_code&lt;PQEncoder16&gt;(*<span class="keyword">this</span>, x, code);</div>
<div class="line"><a name="l00362"></a><span class="lineno">  362</span>&#160;      <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00363"></a><span class="lineno">  363</span>&#160;</div>
<div class="line"><a name="l00364"></a><span class="lineno">  364</span>&#160;    <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00365"></a><span class="lineno">  365</span>&#160;      faiss::compute_code&lt;PQEncoderGeneric&gt;(*<span class="keyword">this</span>, x, code);</div>
<div class="line"><a name="l00366"></a><span class="lineno">  366</span>&#160;      <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00367"></a><span class="lineno">  367</span>&#160;  }</div>
<div class="line"><a name="l00368"></a><span class="lineno">  368</span>&#160;}</div>
<div class="line"><a name="l00369"></a><span class="lineno">  369</span>&#160;</div>
<div class="line"><a name="l00370"></a><span class="lineno">  370</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">class</span> PQDecoder&gt;</div>
<div class="line"><a name="l00371"></a><span class="lineno">  371</span>&#160;<span class="keywordtype">void</span> decode(<span class="keyword">const</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html">ProductQuantizer</a>&amp; pq, <span class="keyword">const</span> uint8_t *code, <span class="keywordtype">float</span> *x)</div>
<div class="line"><a name="l00372"></a><span class="lineno">  372</span>&#160;{</div>
<div class="line"><a name="l00373"></a><span class="lineno">  373</span>&#160;  PQDecoder decoder(code, pq.<a class="code" href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">nbits</a>);</div>
<div class="line"><a name="l00374"></a><span class="lineno">  374</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m &lt; pq.<a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;    uint64_t c = decoder.decode();</div>
<div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160;    memcpy(x + m * pq.<a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>, pq.<a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, c), <span class="keyword">sizeof</span>(float) * pq.<a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>);</div>
<div class="line"><a name="l00377"></a><span class="lineno">  377</span>&#160;  }</div>
<div class="line"><a name="l00378"></a><span class="lineno">  378</span>&#160;}</div>
<div class="line"><a name="l00379"></a><span class="lineno">  379</span>&#160;</div>
<div class="line"><a name="l00380"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208">  380</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208">ProductQuantizer::decode</a> (<span class="keyword">const</span> uint8_t *code, <span class="keywordtype">float</span> *x)<span class="keyword"> const</span></div>
<div class="line"><a name="l00381"></a><span class="lineno">  381</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00382"></a><span class="lineno">  382</span>&#160;  <span class="keywordflow">switch</span> (nbits) {</div>
<div class="line"><a name="l00383"></a><span class="lineno">  383</span>&#160;    <span class="keywordflow">case</span> 8:</div>
<div class="line"><a name="l00384"></a><span class="lineno">  384</span>&#160;      faiss::decode&lt;PQDecoder8&gt;(*<span class="keyword">this</span>, code, x);</div>
<div class="line"><a name="l00385"></a><span class="lineno">  385</span>&#160;      <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00386"></a><span class="lineno">  386</span>&#160;</div>
<div class="line"><a name="l00387"></a><span class="lineno">  387</span>&#160;    <span class="keywordflow">case</span> 16:</div>
<div class="line"><a name="l00388"></a><span class="lineno">  388</span>&#160;      faiss::decode&lt;PQDecoder16&gt;(*<span class="keyword">this</span>, code, x);</div>
<div class="line"><a name="l00389"></a><span class="lineno">  389</span>&#160;      <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00390"></a><span class="lineno">  390</span>&#160;</div>
<div class="line"><a name="l00391"></a><span class="lineno">  391</span>&#160;    <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00392"></a><span class="lineno">  392</span>&#160;      faiss::decode&lt;PQDecoderGeneric&gt;(*<span class="keyword">this</span>, code, x);</div>
<div class="line"><a name="l00393"></a><span class="lineno">  393</span>&#160;      <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00394"></a><span class="lineno">  394</span>&#160;  }</div>
<div class="line"><a name="l00395"></a><span class="lineno">  395</span>&#160;}</div>
<div class="line"><a name="l00396"></a><span class="lineno">  396</span>&#160;</div>
<div class="line"><a name="l00397"></a><span class="lineno">  397</span>&#160;</div>
<div class="line"><a name="l00398"></a><span class="lineno">  398</span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208">ProductQuantizer::decode</a> (<span class="keyword">const</span> uint8_t *code, <span class="keywordtype">float</span> *x, <span class="keywordtype">size_t</span> n)<span class="keyword"> const</span></div>
<div class="line"><a name="l00399"></a><span class="lineno">  399</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00400"></a><span class="lineno">  400</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; n; i++) {</div>
<div class="line"><a name="l00401"></a><span class="lineno">  401</span>&#160;        this-&gt;<a class="code" href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208">decode</a> (code + <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a> * i, x + d * i);</div>
<div class="line"><a name="l00402"></a><span class="lineno">  402</span>&#160;    }</div>
<div class="line"><a name="l00403"></a><span class="lineno">  403</span>&#160;}</div>
<div class="line"><a name="l00404"></a><span class="lineno">  404</span>&#160;</div>
<div class="line"><a name="l00405"></a><span class="lineno">  405</span>&#160;</div>
<div class="line"><a name="l00406"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a95060fedd7c09eb20e968fd2fdb4b316">  406</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a95060fedd7c09eb20e968fd2fdb4b316">ProductQuantizer::compute_code_from_distance_table</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> *tab,</div>
<div class="line"><a name="l00407"></a><span class="lineno">  407</span>&#160;                                                         uint8_t *code)<span class="keyword"> const</span></div>
<div class="line"><a name="l00408"></a><span class="lineno">  408</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00409"></a><span class="lineno">  409</span>&#160;  <a class="code" href="structfaiss_1_1ProductQuantizer_1_1PQEncoderGeneric.html">PQEncoderGeneric</a> encoder(code, nbits);</div>
<div class="line"><a name="l00410"></a><span class="lineno">  410</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00411"></a><span class="lineno">  411</span>&#160;    <span class="keywordtype">float</span> mindis = 1e20;</div>
<div class="line"><a name="l00412"></a><span class="lineno">  412</span>&#160;    uint64_t idxm = 0;</div>
<div class="line"><a name="l00413"></a><span class="lineno">  413</span>&#160;</div>
<div class="line"><a name="l00414"></a><span class="lineno">  414</span>&#160;    <span class="comment">/* Find best centroid */</span></div>
<div class="line"><a name="l00415"></a><span class="lineno">  415</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>; j++) {</div>
<div class="line"><a name="l00416"></a><span class="lineno">  416</span>&#160;      <span class="keywordtype">float</span> dis = *tab++;</div>
<div class="line"><a name="l00417"></a><span class="lineno">  417</span>&#160;      <span class="keywordflow">if</span> (dis &lt; mindis) {</div>
<div class="line"><a name="l00418"></a><span class="lineno">  418</span>&#160;        mindis = dis;</div>
<div class="line"><a name="l00419"></a><span class="lineno">  419</span>&#160;        idxm = j;</div>
<div class="line"><a name="l00420"></a><span class="lineno">  420</span>&#160;      }</div>
<div class="line"><a name="l00421"></a><span class="lineno">  421</span>&#160;    }</div>
<div class="line"><a name="l00422"></a><span class="lineno">  422</span>&#160;</div>
<div class="line"><a name="l00423"></a><span class="lineno">  423</span>&#160;    encoder.encode(idxm);</div>
<div class="line"><a name="l00424"></a><span class="lineno">  424</span>&#160;  }</div>
<div class="line"><a name="l00425"></a><span class="lineno">  425</span>&#160;}</div>
<div class="line"><a name="l00426"></a><span class="lineno">  426</span>&#160;</div>
<div class="line"><a name="l00427"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#aecd05d180799f3956065b0c5c54fd406">  427</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#aecd05d180799f3956065b0c5c54fd406">ProductQuantizer::compute_codes_with_assign_index</a> (</div>
<div class="line"><a name="l00428"></a><span class="lineno">  428</span>&#160;                <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00429"></a><span class="lineno">  429</span>&#160;                uint8_t * codes,</div>
<div class="line"><a name="l00430"></a><span class="lineno">  430</span>&#160;                <span class="keywordtype">size_t</span> n)</div>
<div class="line"><a name="l00431"></a><span class="lineno">  431</span>&#160;{</div>
<div class="line"><a name="l00432"></a><span class="lineno">  432</span>&#160;    FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a> &amp;&amp; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a>-&gt;<a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a> == dsub);</div>
<div class="line"><a name="l00433"></a><span class="lineno">  433</span>&#160;</div>
<div class="line"><a name="l00434"></a><span class="lineno">  434</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00435"></a><span class="lineno">  435</span>&#160;        <a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a>-&gt;<a class="code" href="structfaiss_1_1Index.html#a849361f5f0ab0aba8d419c86f2594191">reset</a> ();</div>
<div class="line"><a name="l00436"></a><span class="lineno">  436</span>&#160;        <a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a>-&gt;<a class="code" href="structfaiss_1_1Index.html#a1b5e9ac70adbce0897dd6c8276ad96f2">add</a> (ksub, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a> (m, 0));</div>
<div class="line"><a name="l00437"></a><span class="lineno">  437</span>&#160;        <span class="keywordtype">size_t</span> bs = 65536;</div>
<div class="line"><a name="l00438"></a><span class="lineno">  438</span>&#160;        <span class="keywordtype">float</span> * xslice = <span class="keyword">new</span> <span class="keywordtype">float</span>[bs * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>];</div>
<div class="line"><a name="l00439"></a><span class="lineno">  439</span>&#160;        <a class="code" href="structfaiss_1_1ScopeDeleter.html">ScopeDeleter&lt;float&gt;</a> del (xslice);</div>
<div class="line"><a name="l00440"></a><span class="lineno">  440</span>&#160;        idx_t *assign = <span class="keyword">new</span> idx_t[bs];</div>
<div class="line"><a name="l00441"></a><span class="lineno">  441</span>&#160;        <a class="code" href="structfaiss_1_1ScopeDeleter.html">ScopeDeleter&lt;idx_t&gt;</a> del2 (assign);</div>
<div class="line"><a name="l00442"></a><span class="lineno">  442</span>&#160;</div>
<div class="line"><a name="l00443"></a><span class="lineno">  443</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i0 = 0; i0 &lt; n; i0 += bs) {</div>
<div class="line"><a name="l00444"></a><span class="lineno">  444</span>&#160;            <span class="keywordtype">size_t</span> i1 = std::min(i0 + bs, n);</div>
<div class="line"><a name="l00445"></a><span class="lineno">  445</span>&#160;</div>
<div class="line"><a name="l00446"></a><span class="lineno">  446</span>&#160;            <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = i0; i &lt; i1; i++) {</div>
<div class="line"><a name="l00447"></a><span class="lineno">  447</span>&#160;                memcpy (xslice + (i - i0) * dsub,</div>
<div class="line"><a name="l00448"></a><span class="lineno">  448</span>&#160;                        x + i * d + m * dsub,</div>
<div class="line"><a name="l00449"></a><span class="lineno">  449</span>&#160;                        dsub * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00450"></a><span class="lineno">  450</span>&#160;            }</div>
<div class="line"><a name="l00451"></a><span class="lineno">  451</span>&#160;</div>
<div class="line"><a name="l00452"></a><span class="lineno">  452</span>&#160;            <a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a>-&gt;<a class="code" href="structfaiss_1_1Index.html#a8bc5d8d1cd0dd7b34b3c98a9f76b4a9c">assign</a> (i1 - i0, xslice, assign);</div>
<div class="line"><a name="l00453"></a><span class="lineno">  453</span>&#160;</div>
<div class="line"><a name="l00454"></a><span class="lineno">  454</span>&#160;            <span class="keywordflow">if</span> (nbits == 8) {</div>
<div class="line"><a name="l00455"></a><span class="lineno">  455</span>&#160;              uint8_t *c = codes + <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a> * i0 + m;</div>
<div class="line"><a name="l00456"></a><span class="lineno">  456</span>&#160;              <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = i0; i &lt; i1; i++) {</div>
<div class="line"><a name="l00457"></a><span class="lineno">  457</span>&#160;                *c = assign[i - i0];</div>
<div class="line"><a name="l00458"></a><span class="lineno">  458</span>&#160;                c += <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>;</div>
<div class="line"><a name="l00459"></a><span class="lineno">  459</span>&#160;              }</div>
<div class="line"><a name="l00460"></a><span class="lineno">  460</span>&#160;            } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (nbits == 16) {</div>
<div class="line"><a name="l00461"></a><span class="lineno">  461</span>&#160;              uint16_t *c = (uint16_t*)(codes + <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a> * i0 + m * 2);</div>
<div class="line"><a name="l00462"></a><span class="lineno">  462</span>&#160;              <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = i0; i &lt; i1; i++) {</div>
<div class="line"><a name="l00463"></a><span class="lineno">  463</span>&#160;                *c = assign[i - i0];</div>
<div class="line"><a name="l00464"></a><span class="lineno">  464</span>&#160;                c += <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>;</div>
<div class="line"><a name="l00465"></a><span class="lineno">  465</span>&#160;              }</div>
<div class="line"><a name="l00466"></a><span class="lineno">  466</span>&#160;            } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00467"></a><span class="lineno">  467</span>&#160;              <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = i0; i &lt; i1; ++i) {</div>
<div class="line"><a name="l00468"></a><span class="lineno">  468</span>&#160;                uint8_t *c = codes + <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a> * i + ((m * <a class="code" href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">nbits</a>) / 8);</div>
<div class="line"><a name="l00469"></a><span class="lineno">  469</span>&#160;                uint8_t offset = (m * <a class="code" href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">nbits</a>) % 8;</div>
<div class="line"><a name="l00470"></a><span class="lineno">  470</span>&#160;                uint64_t ass = assign[i - i0];</div>
<div class="line"><a name="l00471"></a><span class="lineno">  471</span>&#160;</div>
<div class="line"><a name="l00472"></a><span class="lineno">  472</span>&#160;                <a class="code" href="structfaiss_1_1ProductQuantizer_1_1PQEncoderGeneric.html">PQEncoderGeneric</a> encoder(c, nbits, offset);</div>
<div class="line"><a name="l00473"></a><span class="lineno">  473</span>&#160;                encoder.encode(ass);</div>
<div class="line"><a name="l00474"></a><span class="lineno">  474</span>&#160;              }</div>
<div class="line"><a name="l00475"></a><span class="lineno">  475</span>&#160;            }</div>
<div class="line"><a name="l00476"></a><span class="lineno">  476</span>&#160;</div>
<div class="line"><a name="l00477"></a><span class="lineno">  477</span>&#160;        }</div>
<div class="line"><a name="l00478"></a><span class="lineno">  478</span>&#160;    }</div>
<div class="line"><a name="l00479"></a><span class="lineno">  479</span>&#160;</div>
<div class="line"><a name="l00480"></a><span class="lineno">  480</span>&#160;}</div>
<div class="line"><a name="l00481"></a><span class="lineno">  481</span>&#160;</div>
<div class="line"><a name="l00482"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#ae5a340ee5a4b1d35a565b167de2a2ef1">  482</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#ae5a340ee5a4b1d35a565b167de2a2ef1">ProductQuantizer::compute_codes</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00483"></a><span class="lineno">  483</span>&#160;                                      uint8_t * codes,</div>
<div class="line"><a name="l00484"></a><span class="lineno">  484</span>&#160;                                      <span class="keywordtype">size_t</span> n)<span class="keyword">  const</span></div>
<div class="line"><a name="l00485"></a><span class="lineno">  485</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00486"></a><span class="lineno">  486</span>&#160;  <span class="comment">// process by blocks to avoid using too much RAM</span></div>
<div class="line"><a name="l00487"></a><span class="lineno">  487</span>&#160;    <span class="keywordtype">size_t</span> bs = 256 * 1024;</div>
<div class="line"><a name="l00488"></a><span class="lineno">  488</span>&#160;    <span class="keywordflow">if</span> (n &gt; bs) {</div>
<div class="line"><a name="l00489"></a><span class="lineno">  489</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i0 = 0; i0 &lt; n; i0 += bs) {</div>
<div class="line"><a name="l00490"></a><span class="lineno">  490</span>&#160;            <span class="keywordtype">size_t</span> i1 = std::min(i0 + bs, n);</div>
<div class="line"><a name="l00491"></a><span class="lineno">  491</span>&#160;            <a class="code" href="structfaiss_1_1ProductQuantizer.html#ae5a340ee5a4b1d35a565b167de2a2ef1">compute_codes</a> (x + d * i0, codes + <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a> * i0, i1 - i0);</div>
<div class="line"><a name="l00492"></a><span class="lineno">  492</span>&#160;        }</div>
<div class="line"><a name="l00493"></a><span class="lineno">  493</span>&#160;        <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00494"></a><span class="lineno">  494</span>&#160;    }</div>
<div class="line"><a name="l00495"></a><span class="lineno">  495</span>&#160;</div>
<div class="line"><a name="l00496"></a><span class="lineno">  496</span>&#160;    <span class="keywordflow">if</span> (dsub &lt; 16) { <span class="comment">// simple direct computation</span></div>
<div class="line"><a name="l00497"></a><span class="lineno">  497</span>&#160;</div>
<div class="line"><a name="l00498"></a><span class="lineno">  498</span>&#160;<span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00499"></a><span class="lineno">  499</span>&#160;<span class="preprocessor"></span>        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; n; i++)</div>
<div class="line"><a name="l00500"></a><span class="lineno">  500</span>&#160;            <a class="code" href="structfaiss_1_1ProductQuantizer.html#a08b130e3a21f2699a4e3bbec121fb838">compute_code</a> (x + i * d, codes + i * <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a>);</div>
<div class="line"><a name="l00501"></a><span class="lineno">  501</span>&#160;</div>
<div class="line"><a name="l00502"></a><span class="lineno">  502</span>&#160;    } <span class="keywordflow">else</span> { <span class="comment">// worthwile to use BLAS</span></div>
<div class="line"><a name="l00503"></a><span class="lineno">  503</span>&#160;        <span class="keywordtype">float</span> *dis_tables = <span class="keyword">new</span> <span class="keywordtype">float</span> [n * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>];</div>
<div class="line"><a name="l00504"></a><span class="lineno">  504</span>&#160;        <a class="code" href="structfaiss_1_1ScopeDeleter.html">ScopeDeleter&lt;float&gt;</a> del (dis_tables);</div>
<div class="line"><a name="l00505"></a><span class="lineno">  505</span>&#160;        <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207">compute_distance_tables</a> (n, x, dis_tables);</div>
<div class="line"><a name="l00506"></a><span class="lineno">  506</span>&#160;</div>
<div class="line"><a name="l00507"></a><span class="lineno">  507</span>&#160;<span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00508"></a><span class="lineno">  508</span>&#160;<span class="preprocessor"></span>        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; n; i++) {</div>
<div class="line"><a name="l00509"></a><span class="lineno">  509</span>&#160;            uint8_t * code = codes + i * <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a>;</div>
<div class="line"><a name="l00510"></a><span class="lineno">  510</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">float</span> * tab = dis_tables + i * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>;</div>
<div class="line"><a name="l00511"></a><span class="lineno">  511</span>&#160;            <a class="code" href="structfaiss_1_1ProductQuantizer.html#a95060fedd7c09eb20e968fd2fdb4b316">compute_code_from_distance_table</a> (tab, code);</div>
<div class="line"><a name="l00512"></a><span class="lineno">  512</span>&#160;        }</div>
<div class="line"><a name="l00513"></a><span class="lineno">  513</span>&#160;    }</div>
<div class="line"><a name="l00514"></a><span class="lineno">  514</span>&#160;}</div>
<div class="line"><a name="l00515"></a><span class="lineno">  515</span>&#160;</div>
<div class="line"><a name="l00516"></a><span class="lineno">  516</span>&#160;</div>
<div class="line"><a name="l00517"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a36361f41bcd2fa698f3c39eb7111ed09">  517</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a36361f41bcd2fa698f3c39eb7111ed09">ProductQuantizer::compute_distance_table</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00518"></a><span class="lineno">  518</span>&#160;                                               <span class="keywordtype">float</span> * dis_table)<span class="keyword"> const</span></div>
<div class="line"><a name="l00519"></a><span class="lineno">  519</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00520"></a><span class="lineno">  520</span>&#160;    <span class="keywordtype">size_t</span> m;</div>
<div class="line"><a name="l00521"></a><span class="lineno">  521</span>&#160;</div>
<div class="line"><a name="l00522"></a><span class="lineno">  522</span>&#160;    <span class="keywordflow">for</span> (m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00523"></a><span class="lineno">  523</span>&#160;        fvec_L2sqr_ny (dis_table + m * ksub,</div>
<div class="line"><a name="l00524"></a><span class="lineno">  524</span>&#160;                       x + m * dsub,</div>
<div class="line"><a name="l00525"></a><span class="lineno">  525</span>&#160;                       <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, 0),</div>
<div class="line"><a name="l00526"></a><span class="lineno">  526</span>&#160;                       dsub,</div>
<div class="line"><a name="l00527"></a><span class="lineno">  527</span>&#160;                       ksub);</div>
<div class="line"><a name="l00528"></a><span class="lineno">  528</span>&#160;    }</div>
<div class="line"><a name="l00529"></a><span class="lineno">  529</span>&#160;}</div>
<div class="line"><a name="l00530"></a><span class="lineno">  530</span>&#160;</div>
<div class="line"><a name="l00531"></a><span class="lineno">  531</span>&#160;<span class="keywordtype">void</span> ProductQuantizer::compute_inner_prod_table (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00532"></a><span class="lineno">  532</span>&#160;                                                 <span class="keywordtype">float</span> * dis_table)<span class="keyword"> const</span></div>
<div class="line"><a name="l00533"></a><span class="lineno">  533</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00534"></a><span class="lineno">  534</span>&#160;    <span class="keywordtype">size_t</span> m;</div>
<div class="line"><a name="l00535"></a><span class="lineno">  535</span>&#160;</div>
<div class="line"><a name="l00536"></a><span class="lineno">  536</span>&#160;    <span class="keywordflow">for</span> (m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00537"></a><span class="lineno">  537</span>&#160;        fvec_inner_products_ny (dis_table + m * ksub,</div>
<div class="line"><a name="l00538"></a><span class="lineno">  538</span>&#160;                                x + m * dsub,</div>
<div class="line"><a name="l00539"></a><span class="lineno">  539</span>&#160;                                <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, 0),</div>
<div class="line"><a name="l00540"></a><span class="lineno">  540</span>&#160;                                dsub,</div>
<div class="line"><a name="l00541"></a><span class="lineno">  541</span>&#160;                                ksub);</div>
<div class="line"><a name="l00542"></a><span class="lineno">  542</span>&#160;    }</div>
<div class="line"><a name="l00543"></a><span class="lineno">  543</span>&#160;}</div>
<div class="line"><a name="l00544"></a><span class="lineno">  544</span>&#160;</div>
<div class="line"><a name="l00545"></a><span class="lineno">  545</span>&#160;</div>
<div class="line"><a name="l00546"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207">  546</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207">ProductQuantizer::compute_distance_tables</a> (</div>
<div class="line"><a name="l00547"></a><span class="lineno">  547</span>&#160;           <span class="keywordtype">size_t</span> nx,</div>
<div class="line"><a name="l00548"></a><span class="lineno">  548</span>&#160;           <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00549"></a><span class="lineno">  549</span>&#160;           <span class="keywordtype">float</span> * dis_tables)<span class="keyword"> const</span></div>
<div class="line"><a name="l00550"></a><span class="lineno">  550</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00551"></a><span class="lineno">  551</span>&#160;</div>
<div class="line"><a name="l00552"></a><span class="lineno">  552</span>&#160;    <span class="keywordflow">if</span> (dsub &lt; 16) {</div>
<div class="line"><a name="l00553"></a><span class="lineno">  553</span>&#160;</div>
<div class="line"><a name="l00554"></a><span class="lineno">  554</span>&#160;<span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00555"></a><span class="lineno">  555</span>&#160;<span class="preprocessor"></span>        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; nx; i++) {</div>
<div class="line"><a name="l00556"></a><span class="lineno">  556</span>&#160;            <a class="code" href="structfaiss_1_1ProductQuantizer.html#a36361f41bcd2fa698f3c39eb7111ed09">compute_distance_table</a> (x + i * d, dis_tables + i * ksub * M);</div>
<div class="line"><a name="l00557"></a><span class="lineno">  557</span>&#160;        }</div>
<div class="line"><a name="l00558"></a><span class="lineno">  558</span>&#160;</div>
<div class="line"><a name="l00559"></a><span class="lineno">  559</span>&#160;    } <span class="keywordflow">else</span> { <span class="comment">// use BLAS</span></div>
<div class="line"><a name="l00560"></a><span class="lineno">  560</span>&#160;</div>
<div class="line"><a name="l00561"></a><span class="lineno">  561</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00562"></a><span class="lineno">  562</span>&#160;            <a class="code" href="namespacefaiss.html#a3d9c7db82d43c1f0ab1d28b92bc9fe57">pairwise_L2sqr</a> (dsub,</div>
<div class="line"><a name="l00563"></a><span class="lineno">  563</span>&#160;                            nx, x + dsub * m,</div>
<div class="line"><a name="l00564"></a><span class="lineno">  564</span>&#160;                            ksub, centroids.data() + m * dsub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>,</div>
<div class="line"><a name="l00565"></a><span class="lineno">  565</span>&#160;                            dis_tables + ksub * m,</div>
<div class="line"><a name="l00566"></a><span class="lineno">  566</span>&#160;                            <a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a>, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>, ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>);</div>
<div class="line"><a name="l00567"></a><span class="lineno">  567</span>&#160;        }</div>
<div class="line"><a name="l00568"></a><span class="lineno">  568</span>&#160;    }</div>
<div class="line"><a name="l00569"></a><span class="lineno">  569</span>&#160;}</div>
<div class="line"><a name="l00570"></a><span class="lineno">  570</span>&#160;</div>
<div class="line"><a name="l00571"></a><span class="lineno">  571</span>&#160;<span class="keywordtype">void</span> ProductQuantizer::compute_inner_prod_tables (</div>
<div class="line"><a name="l00572"></a><span class="lineno">  572</span>&#160;           <span class="keywordtype">size_t</span> nx,</div>
<div class="line"><a name="l00573"></a><span class="lineno">  573</span>&#160;           <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00574"></a><span class="lineno">  574</span>&#160;           <span class="keywordtype">float</span> * dis_tables)<span class="keyword"> const</span></div>
<div class="line"><a name="l00575"></a><span class="lineno">  575</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00576"></a><span class="lineno">  576</span>&#160;</div>
<div class="line"><a name="l00577"></a><span class="lineno">  577</span>&#160;    <span class="keywordflow">if</span> (dsub &lt; 16) {</div>
<div class="line"><a name="l00578"></a><span class="lineno">  578</span>&#160;</div>
<div class="line"><a name="l00579"></a><span class="lineno">  579</span>&#160;<span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00580"></a><span class="lineno">  580</span>&#160;<span class="preprocessor"></span>        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; nx; i++) {</div>
<div class="line"><a name="l00581"></a><span class="lineno">  581</span>&#160;            compute_inner_prod_table (x + i * d, dis_tables + i * ksub * M);</div>
<div class="line"><a name="l00582"></a><span class="lineno">  582</span>&#160;        }</div>
<div class="line"><a name="l00583"></a><span class="lineno">  583</span>&#160;</div>
<div class="line"><a name="l00584"></a><span class="lineno">  584</span>&#160;    } <span class="keywordflow">else</span> { <span class="comment">// use BLAS</span></div>
<div class="line"><a name="l00585"></a><span class="lineno">  585</span>&#160;</div>
<div class="line"><a name="l00586"></a><span class="lineno">  586</span>&#160;        <span class="comment">// compute distance tables</span></div>
<div class="line"><a name="l00587"></a><span class="lineno">  587</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00588"></a><span class="lineno">  588</span>&#160;            FINTEGER ldc = ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>, nxi = nx, ksubi = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>,</div>
<div class="line"><a name="l00589"></a><span class="lineno">  589</span>&#160;                dsubi = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>, di = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a>;</div>
<div class="line"><a name="l00590"></a><span class="lineno">  590</span>&#160;            <span class="keywordtype">float</span> one = 1.0, zero = 0;</div>
<div class="line"><a name="l00591"></a><span class="lineno">  591</span>&#160;</div>
<div class="line"><a name="l00592"></a><span class="lineno">  592</span>&#160;            sgemm_ (<span class="stringliteral">&quot;Transposed&quot;</span>, <span class="stringliteral">&quot;Not transposed&quot;</span>,</div>
<div class="line"><a name="l00593"></a><span class="lineno">  593</span>&#160;                    &amp;ksubi, &amp;nxi, &amp;dsubi,</div>
<div class="line"><a name="l00594"></a><span class="lineno">  594</span>&#160;                    &amp;one, &amp;centroids [m * dsub * ksub], &amp;dsubi,</div>
<div class="line"><a name="l00595"></a><span class="lineno">  595</span>&#160;                    x + dsub * m, &amp;di,</div>
<div class="line"><a name="l00596"></a><span class="lineno">  596</span>&#160;                    &amp;zero, dis_tables + ksub * m, &amp;ldc);</div>
<div class="line"><a name="l00597"></a><span class="lineno">  597</span>&#160;        }</div>
<div class="line"><a name="l00598"></a><span class="lineno">  598</span>&#160;</div>
<div class="line"><a name="l00599"></a><span class="lineno">  599</span>&#160;    }</div>
<div class="line"><a name="l00600"></a><span class="lineno">  600</span>&#160;}</div>
<div class="line"><a name="l00601"></a><span class="lineno">  601</span>&#160;</div>
<div class="line"><a name="l00602"></a><span class="lineno">  602</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> C&gt;</div>
<div class="line"><a name="l00603"></a><span class="lineno">  603</span>&#160;<span class="keyword">static</span> <span class="keywordtype">void</span> pq_knn_search_with_tables (</div>
<div class="line"><a name="l00604"></a><span class="lineno">  604</span>&#160;      <span class="keyword">const</span> ProductQuantizer&amp; pq,</div>
<div class="line"><a name="l00605"></a><span class="lineno">  605</span>&#160;      <span class="keywordtype">size_t</span> nbits,</div>
<div class="line"><a name="l00606"></a><span class="lineno">  606</span>&#160;      <span class="keyword">const</span> <span class="keywordtype">float</span> *dis_tables,</div>
<div class="line"><a name="l00607"></a><span class="lineno">  607</span>&#160;      <span class="keyword">const</span> uint8_t * codes,</div>
<div class="line"><a name="l00608"></a><span class="lineno">  608</span>&#160;      <span class="keyword">const</span> <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00609"></a><span class="lineno">  609</span>&#160;      HeapArray&lt;C&gt; * res,</div>
<div class="line"><a name="l00610"></a><span class="lineno">  610</span>&#160;      <span class="keywordtype">bool</span> init_finalize_heap)</div>
<div class="line"><a name="l00611"></a><span class="lineno">  611</span>&#160;{</div>
<div class="line"><a name="l00612"></a><span class="lineno">  612</span>&#160;    <span class="keywordtype">size_t</span> k = res-&gt;k, nx = res-&gt;nh;</div>
<div class="line"><a name="l00613"></a><span class="lineno">  613</span>&#160;    <span class="keywordtype">size_t</span> ksub = pq.ksub, M = pq.M;</div>
<div class="line"><a name="l00614"></a><span class="lineno">  614</span>&#160;</div>
<div class="line"><a name="l00615"></a><span class="lineno">  615</span>&#160;</div>
<div class="line"><a name="l00616"></a><span class="lineno">  616</span>&#160;<span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00617"></a><span class="lineno">  617</span>&#160;<span class="preprocessor"></span>    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; nx; i++) {</div>
<div class="line"><a name="l00618"></a><span class="lineno">  618</span>&#160;        <span class="comment">/* query preparation for asymmetric search: compute look-up tables */</span></div>
<div class="line"><a name="l00619"></a><span class="lineno">  619</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span>* dis_table = dis_tables + i * ksub * M;</div>
<div class="line"><a name="l00620"></a><span class="lineno">  620</span>&#160;</div>
<div class="line"><a name="l00621"></a><span class="lineno">  621</span>&#160;        <span class="comment">/* Compute distances and keep smallest values */</span></div>
<div class="line"><a name="l00622"></a><span class="lineno">  622</span>&#160;        <span class="keywordtype">long</span> * __restrict heap_ids = res-&gt;ids + i * k;</div>
<div class="line"><a name="l00623"></a><span class="lineno">  623</span>&#160;        <span class="keywordtype">float</span> * __restrict heap_dis = res-&gt;val + i * k;</div>
<div class="line"><a name="l00624"></a><span class="lineno">  624</span>&#160;</div>
<div class="line"><a name="l00625"></a><span class="lineno">  625</span>&#160;        <span class="keywordflow">if</span> (init_finalize_heap) {</div>
<div class="line"><a name="l00626"></a><span class="lineno">  626</span>&#160;            heap_heapify&lt;C&gt; (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00627"></a><span class="lineno">  627</span>&#160;        }</div>
<div class="line"><a name="l00628"></a><span class="lineno">  628</span>&#160;</div>
<div class="line"><a name="l00629"></a><span class="lineno">  629</span>&#160;        <span class="keywordflow">switch</span> (nbits) {</div>
<div class="line"><a name="l00630"></a><span class="lineno">  630</span>&#160;          <span class="keywordflow">case</span> 8:</div>
<div class="line"><a name="l00631"></a><span class="lineno">  631</span>&#160;              pq_estimators_from_tables&lt;uint8_t, C&gt; (pq,</div>
<div class="line"><a name="l00632"></a><span class="lineno">  632</span>&#160;                                                     codes, ncodes,</div>
<div class="line"><a name="l00633"></a><span class="lineno">  633</span>&#160;                                                     dis_table,</div>
<div class="line"><a name="l00634"></a><span class="lineno">  634</span>&#160;                                                     k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00635"></a><span class="lineno">  635</span>&#160;              <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00636"></a><span class="lineno">  636</span>&#160;</div>
<div class="line"><a name="l00637"></a><span class="lineno">  637</span>&#160;          <span class="keywordflow">case</span> 16:</div>
<div class="line"><a name="l00638"></a><span class="lineno">  638</span>&#160;              pq_estimators_from_tables&lt;uint16_t, C&gt; (pq,</div>
<div class="line"><a name="l00639"></a><span class="lineno">  639</span>&#160;                                                      (uint16_t*)codes, ncodes,</div>
<div class="line"><a name="l00640"></a><span class="lineno">  640</span>&#160;                                                      dis_table,</div>
<div class="line"><a name="l00641"></a><span class="lineno">  641</span>&#160;                                                      k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00642"></a><span class="lineno">  642</span>&#160;              <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00643"></a><span class="lineno">  643</span>&#160;</div>
<div class="line"><a name="l00644"></a><span class="lineno">  644</span>&#160;          <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00645"></a><span class="lineno">  645</span>&#160;              pq_estimators_from_tables_generic&lt;C&gt; (pq,</div>
<div class="line"><a name="l00646"></a><span class="lineno">  646</span>&#160;                                                    nbits,</div>
<div class="line"><a name="l00647"></a><span class="lineno">  647</span>&#160;                                                    codes, ncodes,</div>
<div class="line"><a name="l00648"></a><span class="lineno">  648</span>&#160;                                                    dis_table,</div>
<div class="line"><a name="l00649"></a><span class="lineno">  649</span>&#160;                                                    k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00650"></a><span class="lineno">  650</span>&#160;              <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00651"></a><span class="lineno">  651</span>&#160;        }</div>
<div class="line"><a name="l00652"></a><span class="lineno">  652</span>&#160;</div>
<div class="line"><a name="l00653"></a><span class="lineno">  653</span>&#160;        <span class="keywordflow">if</span> (init_finalize_heap) {</div>
<div class="line"><a name="l00654"></a><span class="lineno">  654</span>&#160;            heap_reorder&lt;C&gt; (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00655"></a><span class="lineno">  655</span>&#160;        }</div>
<div class="line"><a name="l00656"></a><span class="lineno">  656</span>&#160;    }</div>
<div class="line"><a name="l00657"></a><span class="lineno">  657</span>&#160;}</div>
<div class="line"><a name="l00658"></a><span class="lineno">  658</span>&#160;</div>
<div class="line"><a name="l00659"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a1ae7892a15b9f6809a3ba1a123a7831b">  659</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a1ae7892a15b9f6809a3ba1a123a7831b">ProductQuantizer::search</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict x,</div>
<div class="line"><a name="l00660"></a><span class="lineno">  660</span>&#160;                               <span class="keywordtype">size_t</span> nx,</div>
<div class="line"><a name="l00661"></a><span class="lineno">  661</span>&#160;                               <span class="keyword">const</span> uint8_t * codes,</div>
<div class="line"><a name="l00662"></a><span class="lineno">  662</span>&#160;                               <span class="keyword">const</span> <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00663"></a><span class="lineno">  663</span>&#160;                               <a class="code" href="structfaiss_1_1HeapArray.html">float_maxheap_array_t</a> * res,</div>
<div class="line"><a name="l00664"></a><span class="lineno">  664</span>&#160;                               <span class="keywordtype">bool</span> init_finalize_heap)<span class="keyword"> const</span></div>
<div class="line"><a name="l00665"></a><span class="lineno">  665</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00666"></a><span class="lineno">  666</span>&#160;    FAISS_THROW_IF_NOT (nx == res-&gt;<a class="code" href="structfaiss_1_1HeapArray.html#aad477a3907c3496159eaf4b375be4432">nh</a>);</div>
<div class="line"><a name="l00667"></a><span class="lineno">  667</span>&#160;    std::unique_ptr&lt;float[]&gt; dis_tables(<span class="keyword">new</span> <span class="keywordtype">float</span> [nx * ksub * M]);</div>
<div class="line"><a name="l00668"></a><span class="lineno">  668</span>&#160;    <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207">compute_distance_tables</a> (nx, x, dis_tables.get());</div>
<div class="line"><a name="l00669"></a><span class="lineno">  669</span>&#160;</div>
<div class="line"><a name="l00670"></a><span class="lineno">  670</span>&#160;    pq_knn_search_with_tables&lt;CMax&lt;float, long&gt;&gt; (</div>
<div class="line"><a name="l00671"></a><span class="lineno">  671</span>&#160;      *<span class="keyword">this</span>, <a class="code" href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">nbits</a>, dis_tables.get(), codes, ncodes, res, init_finalize_heap);</div>
<div class="line"><a name="l00672"></a><span class="lineno">  672</span>&#160;}</div>
<div class="line"><a name="l00673"></a><span class="lineno">  673</span>&#160;</div>
<div class="line"><a name="l00674"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a66be226806ca2abcaaf1653cdc690aa6">  674</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a66be226806ca2abcaaf1653cdc690aa6">ProductQuantizer::search_ip</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict x,</div>
<div class="line"><a name="l00675"></a><span class="lineno">  675</span>&#160;                               <span class="keywordtype">size_t</span> nx,</div>
<div class="line"><a name="l00676"></a><span class="lineno">  676</span>&#160;                               <span class="keyword">const</span> uint8_t * codes,</div>
<div class="line"><a name="l00677"></a><span class="lineno">  677</span>&#160;                               <span class="keyword">const</span> <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00678"></a><span class="lineno">  678</span>&#160;                               <a class="code" href="structfaiss_1_1HeapArray.html">float_minheap_array_t</a> * res,</div>
<div class="line"><a name="l00679"></a><span class="lineno">  679</span>&#160;                               <span class="keywordtype">bool</span> init_finalize_heap)<span class="keyword"> const</span></div>
<div class="line"><a name="l00680"></a><span class="lineno">  680</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00681"></a><span class="lineno">  681</span>&#160;    FAISS_THROW_IF_NOT (nx == res-&gt;<a class="code" href="structfaiss_1_1HeapArray.html#aad477a3907c3496159eaf4b375be4432">nh</a>);</div>
<div class="line"><a name="l00682"></a><span class="lineno">  682</span>&#160;    std::unique_ptr&lt;float[]&gt; dis_tables(<span class="keyword">new</span> <span class="keywordtype">float</span> [nx * ksub * M]);</div>
<div class="line"><a name="l00683"></a><span class="lineno">  683</span>&#160;    compute_inner_prod_tables (nx, x, dis_tables.get());</div>
<div class="line"><a name="l00684"></a><span class="lineno">  684</span>&#160;</div>
<div class="line"><a name="l00685"></a><span class="lineno">  685</span>&#160;    pq_knn_search_with_tables&lt;CMin&lt;float, long&gt; &gt; (</div>
<div class="line"><a name="l00686"></a><span class="lineno">  686</span>&#160;      *<span class="keyword">this</span>, <a class="code" href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">nbits</a>, dis_tables.get(), codes, ncodes, res, init_finalize_heap);</div>
<div class="line"><a name="l00687"></a><span class="lineno">  687</span>&#160;}</div>
<div class="line"><a name="l00688"></a><span class="lineno">  688</span>&#160;</div>
<div class="line"><a name="l00689"></a><span class="lineno">  689</span>&#160;</div>
<div class="line"><a name="l00690"></a><span class="lineno">  690</span>&#160;</div>
<div class="line"><a name="l00691"></a><span class="lineno">  691</span>&#160;<span class="keyword">static</span> <span class="keywordtype">float</span> sqr (<span class="keywordtype">float</span> x) {</div>
<div class="line"><a name="l00692"></a><span class="lineno">  692</span>&#160;    <span class="keywordflow">return</span> x * x;</div>
<div class="line"><a name="l00693"></a><span class="lineno">  693</span>&#160;}</div>
<div class="line"><a name="l00694"></a><span class="lineno">  694</span>&#160;</div>
<div class="line"><a name="l00695"></a><span class="lineno">  695</span>&#160;<span class="keywordtype">void</span> ProductQuantizer::compute_sdc_table ()</div>
<div class="line"><a name="l00696"></a><span class="lineno">  696</span>&#160;{</div>
<div class="line"><a name="l00697"></a><span class="lineno">  697</span>&#160;    <a class="code" href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">sdc_table</a>.resize (M * ksub * ksub);</div>
<div class="line"><a name="l00698"></a><span class="lineno">  698</span>&#160;</div>
<div class="line"><a name="l00699"></a><span class="lineno">  699</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00700"></a><span class="lineno">  700</span>&#160;</div>
<div class="line"><a name="l00701"></a><span class="lineno">  701</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span> *cents = centroids.data() + m * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>;</div>
<div class="line"><a name="l00702"></a><span class="lineno">  702</span>&#160;        <span class="keywordtype">float</span> * dis_tab = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">sdc_table</a>.data() + m * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>;</div>
<div class="line"><a name="l00703"></a><span class="lineno">  703</span>&#160;</div>
<div class="line"><a name="l00704"></a><span class="lineno">  704</span>&#160;        <span class="comment">// TODO optimize with BLAS</span></div>
<div class="line"><a name="l00705"></a><span class="lineno">  705</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>; i++) {</div>
<div class="line"><a name="l00706"></a><span class="lineno">  706</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">float</span> *centi = cents + i * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>;</div>
<div class="line"><a name="l00707"></a><span class="lineno">  707</span>&#160;            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>; j++) {</div>
<div class="line"><a name="l00708"></a><span class="lineno">  708</span>&#160;                <span class="keywordtype">float</span> accu = 0;</div>
<div class="line"><a name="l00709"></a><span class="lineno">  709</span>&#160;                <span class="keyword">const</span> <span class="keywordtype">float</span> *centj = cents + j * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>;</div>
<div class="line"><a name="l00710"></a><span class="lineno">  710</span>&#160;                <span class="keywordflow">for</span> (<span class="keywordtype">int</span> k = 0; k &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>; k++)</div>
<div class="line"><a name="l00711"></a><span class="lineno">  711</span>&#160;                    accu += sqr (centi[k] - centj[k]);</div>
<div class="line"><a name="l00712"></a><span class="lineno">  712</span>&#160;                dis_tab [i + j * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>] = accu;</div>
<div class="line"><a name="l00713"></a><span class="lineno">  713</span>&#160;            }</div>
<div class="line"><a name="l00714"></a><span class="lineno">  714</span>&#160;        }</div>
<div class="line"><a name="l00715"></a><span class="lineno">  715</span>&#160;    }</div>
<div class="line"><a name="l00716"></a><span class="lineno">  716</span>&#160;}</div>
<div class="line"><a name="l00717"></a><span class="lineno">  717</span>&#160;</div>
<div class="line"><a name="l00718"></a><span class="lineno">  718</span>&#160;<span class="keywordtype">void</span> ProductQuantizer::search_sdc (<span class="keyword">const</span> uint8_t * qcodes,</div>
<div class="line"><a name="l00719"></a><span class="lineno">  719</span>&#160;                     <span class="keywordtype">size_t</span> nq,</div>
<div class="line"><a name="l00720"></a><span class="lineno">  720</span>&#160;                     <span class="keyword">const</span> uint8_t * bcodes,</div>
<div class="line"><a name="l00721"></a><span class="lineno">  721</span>&#160;                     <span class="keyword">const</span> <span class="keywordtype">size_t</span> nb,</div>
<div class="line"><a name="l00722"></a><span class="lineno">  722</span>&#160;                     float_maxheap_array_t * res,</div>
<div class="line"><a name="l00723"></a><span class="lineno">  723</span>&#160;                     <span class="keywordtype">bool</span> init_finalize_heap)<span class="keyword"> const</span></div>
<div class="line"><a name="l00724"></a><span class="lineno">  724</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00725"></a><span class="lineno">  725</span>&#160;    FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">sdc_table</a>.size() == M * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>);</div>
<div class="line"><a name="l00726"></a><span class="lineno">  726</span>&#160;    FAISS_THROW_IF_NOT (nbits == 8);</div>
<div class="line"><a name="l00727"></a><span class="lineno">  727</span>&#160;    <span class="keywordtype">size_t</span> k = res-&gt;k;</div>
<div class="line"><a name="l00728"></a><span class="lineno">  728</span>&#160;</div>
<div class="line"><a name="l00729"></a><span class="lineno">  729</span>&#160;</div>
<div class="line"><a name="l00730"></a><span class="lineno">  730</span>&#160;<span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00731"></a><span class="lineno">  731</span>&#160;<span class="preprocessor"></span>    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; nq; i++) {</div>
<div class="line"><a name="l00732"></a><span class="lineno">  732</span>&#160;</div>
<div class="line"><a name="l00733"></a><span class="lineno">  733</span>&#160;        <span class="comment">/* Compute distances and keep smallest values */</span></div>
<div class="line"><a name="l00734"></a><span class="lineno">  734</span>&#160;        <span class="keywordtype">long</span> * heap_ids = res-&gt;ids + i * k;</div>
<div class="line"><a name="l00735"></a><span class="lineno">  735</span>&#160;        <span class="keywordtype">float</span> *  heap_dis = res-&gt;val + i * k;</div>
<div class="line"><a name="l00736"></a><span class="lineno">  736</span>&#160;        <span class="keyword">const</span> uint8_t * qcode = qcodes + i * <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a>;</div>
<div class="line"><a name="l00737"></a><span class="lineno">  737</span>&#160;</div>
<div class="line"><a name="l00738"></a><span class="lineno">  738</span>&#160;        <span class="keywordflow">if</span> (init_finalize_heap)</div>
<div class="line"><a name="l00739"></a><span class="lineno">  739</span>&#160;            maxheap_heapify (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00740"></a><span class="lineno">  740</span>&#160;</div>
<div class="line"><a name="l00741"></a><span class="lineno">  741</span>&#160;        <span class="keyword">const</span> uint8_t * bcode = bcodes;</div>
<div class="line"><a name="l00742"></a><span class="lineno">  742</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j &lt; nb; j++) {</div>
<div class="line"><a name="l00743"></a><span class="lineno">  743</span>&#160;            <span class="keywordtype">float</span> dis = 0;</div>
<div class="line"><a name="l00744"></a><span class="lineno">  744</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">float</span> * tab = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">sdc_table</a>.data();</div>
<div class="line"><a name="l00745"></a><span class="lineno">  745</span>&#160;            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m &lt; <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00746"></a><span class="lineno">  746</span>&#160;                dis += tab[bcode[m] + qcode[m] * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>];</div>
<div class="line"><a name="l00747"></a><span class="lineno">  747</span>&#160;                tab += ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>;</div>
<div class="line"><a name="l00748"></a><span class="lineno">  748</span>&#160;            }</div>
<div class="line"><a name="l00749"></a><span class="lineno">  749</span>&#160;            <span class="keywordflow">if</span> (dis &lt; heap_dis[0]) {</div>
<div class="line"><a name="l00750"></a><span class="lineno">  750</span>&#160;                maxheap_pop (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00751"></a><span class="lineno">  751</span>&#160;                maxheap_push (k, heap_dis, heap_ids, dis, j);</div>
<div class="line"><a name="l00752"></a><span class="lineno">  752</span>&#160;            }</div>
<div class="line"><a name="l00753"></a><span class="lineno">  753</span>&#160;            bcode += <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a>;</div>
<div class="line"><a name="l00754"></a><span class="lineno">  754</span>&#160;        }</div>
<div class="line"><a name="l00755"></a><span class="lineno">  755</span>&#160;</div>
<div class="line"><a name="l00756"></a><span class="lineno">  756</span>&#160;        <span class="keywordflow">if</span> (init_finalize_heap)</div>
<div class="line"><a name="l00757"></a><span class="lineno">  757</span>&#160;            maxheap_reorder (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00758"></a><span class="lineno">  758</span>&#160;    }</div>
<div class="line"><a name="l00759"></a><span class="lineno">  759</span>&#160;</div>
<div class="line"><a name="l00760"></a><span class="lineno">  760</span>&#160;}</div>
<div class="line"><a name="l00761"></a><span class="lineno">  761</span>&#160;</div>
<div class="line"><a name="l00762"></a><span class="lineno">  762</span>&#160;</div>
<div class="line"><a name="l00763"></a><span class="lineno">  763</span>&#160;ProductQuantizer::PQEncoderGeneric::PQEncoderGeneric(uint8_t *code, <span class="keywordtype">int</span> nbits,</div>
<div class="line"><a name="l00764"></a><span class="lineno">  764</span>&#160;                                                     uint8_t offset)</div>
<div class="line"><a name="l00765"></a><span class="lineno">  765</span>&#160;    : code(code), offset(offset), nbits(nbits), reg(0) {</div>
<div class="line"><a name="l00766"></a><span class="lineno">  766</span>&#160;  assert(nbits &lt;= 64);</div>
<div class="line"><a name="l00767"></a><span class="lineno">  767</span>&#160;  <span class="keywordflow">if</span> (offset &gt; 0) {</div>
<div class="line"><a name="l00768"></a><span class="lineno">  768</span>&#160;    reg = (*code &amp; ((1 &lt;&lt; offset) - 1));</div>
<div class="line"><a name="l00769"></a><span class="lineno">  769</span>&#160;  }</div>
<div class="line"><a name="l00770"></a><span class="lineno">  770</span>&#160;}</div>
<div class="line"><a name="l00771"></a><span class="lineno">  771</span>&#160;</div>
<div class="line"><a name="l00772"></a><span class="lineno">  772</span>&#160;<span class="keywordtype">void</span> ProductQuantizer::PQEncoderGeneric::encode(uint64_t x) {</div>
<div class="line"><a name="l00773"></a><span class="lineno">  773</span>&#160;  reg |= (uint8_t)(x &lt;&lt; offset);</div>
<div class="line"><a name="l00774"></a><span class="lineno">  774</span>&#160;  x &gt;&gt;= (8 - offset);</div>
<div class="line"><a name="l00775"></a><span class="lineno">  775</span>&#160;  <span class="keywordflow">if</span> (offset + nbits &gt;= 8) {</div>
<div class="line"><a name="l00776"></a><span class="lineno">  776</span>&#160;    *code++ = reg;</div>
<div class="line"><a name="l00777"></a><span class="lineno">  777</span>&#160;</div>
<div class="line"><a name="l00778"></a><span class="lineno">  778</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; (nbits - (8 - offset)) / 8; ++i) {</div>
<div class="line"><a name="l00779"></a><span class="lineno">  779</span>&#160;      *code++ = (uint8_t)x;</div>
<div class="line"><a name="l00780"></a><span class="lineno">  780</span>&#160;      x &gt;&gt;= 8;</div>
<div class="line"><a name="l00781"></a><span class="lineno">  781</span>&#160;    }</div>
<div class="line"><a name="l00782"></a><span class="lineno">  782</span>&#160;</div>
<div class="line"><a name="l00783"></a><span class="lineno">  783</span>&#160;    offset += <a class="code" href="structfaiss_1_1ProductQuantizer_1_1PQEncoderGeneric.html#a91b56a2563f5c58bb9492272cacf42f3">nbits</a>;</div>
<div class="line"><a name="l00784"></a><span class="lineno">  784</span>&#160;    offset &amp;= 7;</div>
<div class="line"><a name="l00785"></a><span class="lineno">  785</span>&#160;    reg = (uint8_t)x;</div>
<div class="line"><a name="l00786"></a><span class="lineno">  786</span>&#160;  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00787"></a><span class="lineno">  787</span>&#160;    offset += <a class="code" href="structfaiss_1_1ProductQuantizer_1_1PQEncoderGeneric.html#a91b56a2563f5c58bb9492272cacf42f3">nbits</a>;</div>
<div class="line"><a name="l00788"></a><span class="lineno">  788</span>&#160;  }</div>
<div class="line"><a name="l00789"></a><span class="lineno">  789</span>&#160;}</div>
<div class="line"><a name="l00790"></a><span class="lineno">  790</span>&#160;</div>
<div class="line"><a name="l00791"></a><span class="lineno">  791</span>&#160;ProductQuantizer::PQEncoderGeneric::~PQEncoderGeneric() {</div>
<div class="line"><a name="l00792"></a><span class="lineno">  792</span>&#160;  <span class="keywordflow">if</span> (offset &gt; 0) {</div>
<div class="line"><a name="l00793"></a><span class="lineno">  793</span>&#160;    *code = reg;</div>
<div class="line"><a name="l00794"></a><span class="lineno">  794</span>&#160;  }</div>
<div class="line"><a name="l00795"></a><span class="lineno">  795</span>&#160;}</div>
<div class="line"><a name="l00796"></a><span class="lineno">  796</span>&#160;</div>
<div class="line"><a name="l00797"></a><span class="lineno">  797</span>&#160;</div>
<div class="line"><a name="l00798"></a><span class="lineno">  798</span>&#160;ProductQuantizer::PQEncoder8::PQEncoder8(uint8_t *code, <span class="keywordtype">int</span> nbits)</div>
<div class="line"><a name="l00799"></a><span class="lineno">  799</span>&#160;    : code(code) {</div>
<div class="line"><a name="l00800"></a><span class="lineno">  800</span>&#160;  assert(8 == nbits);</div>
<div class="line"><a name="l00801"></a><span class="lineno">  801</span>&#160;}</div>
<div class="line"><a name="l00802"></a><span class="lineno">  802</span>&#160;</div>
<div class="line"><a name="l00803"></a><span class="lineno">  803</span>&#160;<span class="keywordtype">void</span> ProductQuantizer::PQEncoder8::encode(uint64_t x) {</div>
<div class="line"><a name="l00804"></a><span class="lineno">  804</span>&#160;  *code++ = (uint8_t)x;</div>
<div class="line"><a name="l00805"></a><span class="lineno">  805</span>&#160;}</div>
<div class="line"><a name="l00806"></a><span class="lineno">  806</span>&#160;</div>
<div class="line"><a name="l00807"></a><span class="lineno">  807</span>&#160;</div>
<div class="line"><a name="l00808"></a><span class="lineno">  808</span>&#160;ProductQuantizer::PQEncoder16::PQEncoder16(uint8_t *code, <span class="keywordtype">int</span> nbits)</div>
<div class="line"><a name="l00809"></a><span class="lineno">  809</span>&#160;    : code((uint16_t *)code) {</div>
<div class="line"><a name="l00810"></a><span class="lineno">  810</span>&#160;  assert(16 == nbits);</div>
<div class="line"><a name="l00811"></a><span class="lineno">  811</span>&#160;}</div>
<div class="line"><a name="l00812"></a><span class="lineno">  812</span>&#160;</div>
<div class="line"><a name="l00813"></a><span class="lineno">  813</span>&#160;<span class="keywordtype">void</span> ProductQuantizer::PQEncoder16::encode(uint64_t x) {</div>
<div class="line"><a name="l00814"></a><span class="lineno">  814</span>&#160;  *code++ = (uint16_t)x;</div>
<div class="line"><a name="l00815"></a><span class="lineno">  815</span>&#160;}</div>
<div class="line"><a name="l00816"></a><span class="lineno">  816</span>&#160;</div>
<div class="line"><a name="l00817"></a><span class="lineno">  817</span>&#160;</div>
<div class="line"><a name="l00818"></a><span class="lineno">  818</span>&#160;ProductQuantizer::PQDecoderGeneric::PQDecoderGeneric(<span class="keyword">const</span> uint8_t *code,</div>
<div class="line"><a name="l00819"></a><span class="lineno">  819</span>&#160;                                                     <span class="keywordtype">int</span> nbits)</div>
<div class="line"><a name="l00820"></a><span class="lineno">  820</span>&#160;    : code(code),</div>
<div class="line"><a name="l00821"></a><span class="lineno">  821</span>&#160;      offset(0),</div>
<div class="line"><a name="l00822"></a><span class="lineno">  822</span>&#160;      nbits(nbits),</div>
<div class="line"><a name="l00823"></a><span class="lineno">  823</span>&#160;      mask((1ull &lt;&lt; nbits) - 1),</div>
<div class="line"><a name="l00824"></a><span class="lineno">  824</span>&#160;      reg(0) {</div>
<div class="line"><a name="l00825"></a><span class="lineno">  825</span>&#160;  assert(nbits &lt;= 64);</div>
<div class="line"><a name="l00826"></a><span class="lineno">  826</span>&#160;}</div>
<div class="line"><a name="l00827"></a><span class="lineno">  827</span>&#160;</div>
<div class="line"><a name="l00828"></a><span class="lineno">  828</span>&#160;uint64_t ProductQuantizer::PQDecoderGeneric::decode() {</div>
<div class="line"><a name="l00829"></a><span class="lineno">  829</span>&#160;  <span class="keywordflow">if</span> (offset == 0) {</div>
<div class="line"><a name="l00830"></a><span class="lineno">  830</span>&#160;    reg = *code;</div>
<div class="line"><a name="l00831"></a><span class="lineno">  831</span>&#160;  }</div>
<div class="line"><a name="l00832"></a><span class="lineno">  832</span>&#160;  uint64_t c = (reg &gt;&gt; offset);</div>
<div class="line"><a name="l00833"></a><span class="lineno">  833</span>&#160;</div>
<div class="line"><a name="l00834"></a><span class="lineno">  834</span>&#160;  <span class="keywordflow">if</span> (offset + nbits &gt;= 8) {</div>
<div class="line"><a name="l00835"></a><span class="lineno">  835</span>&#160;    uint64_t e = 8 - offset;</div>
<div class="line"><a name="l00836"></a><span class="lineno">  836</span>&#160;    ++code;</div>
<div class="line"><a name="l00837"></a><span class="lineno">  837</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; (nbits - (8 - offset)) / 8; ++i) {</div>
<div class="line"><a name="l00838"></a><span class="lineno">  838</span>&#160;      c |= ((uint64_t)(*code++) &lt;&lt; e);</div>
<div class="line"><a name="l00839"></a><span class="lineno">  839</span>&#160;      e += 8;</div>
<div class="line"><a name="l00840"></a><span class="lineno">  840</span>&#160;    }</div>
<div class="line"><a name="l00841"></a><span class="lineno">  841</span>&#160;</div>
<div class="line"><a name="l00842"></a><span class="lineno">  842</span>&#160;    offset += nbits;</div>
<div class="line"><a name="l00843"></a><span class="lineno">  843</span>&#160;    offset &amp;= 7;</div>
<div class="line"><a name="l00844"></a><span class="lineno">  844</span>&#160;    <span class="keywordflow">if</span> (offset &gt; 0) {</div>
<div class="line"><a name="l00845"></a><span class="lineno">  845</span>&#160;      reg = *code;</div>
<div class="line"><a name="l00846"></a><span class="lineno">  846</span>&#160;      c |= ((uint64_t)reg &lt;&lt; e);</div>
<div class="line"><a name="l00847"></a><span class="lineno">  847</span>&#160;    }</div>
<div class="line"><a name="l00848"></a><span class="lineno">  848</span>&#160;  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00849"></a><span class="lineno">  849</span>&#160;    offset += nbits;</div>
<div class="line"><a name="l00850"></a><span class="lineno">  850</span>&#160;  }</div>
<div class="line"><a name="l00851"></a><span class="lineno">  851</span>&#160;</div>
<div class="line"><a name="l00852"></a><span class="lineno">  852</span>&#160;  <span class="keywordflow">return</span> c &amp; mask;</div>
<div class="line"><a name="l00853"></a><span class="lineno">  853</span>&#160;}</div>
<div class="line"><a name="l00854"></a><span class="lineno">  854</span>&#160;</div>
<div class="line"><a name="l00855"></a><span class="lineno">  855</span>&#160;</div>
<div class="line"><a name="l00856"></a><span class="lineno">  856</span>&#160;ProductQuantizer::PQDecoder8::PQDecoder8(<span class="keyword">const</span> uint8_t *code, <span class="keywordtype">int</span> nbits)</div>
<div class="line"><a name="l00857"></a><span class="lineno">  857</span>&#160;    : code(code) {</div>
<div class="line"><a name="l00858"></a><span class="lineno">  858</span>&#160;  assert(8 == nbits);</div>
<div class="line"><a name="l00859"></a><span class="lineno">  859</span>&#160;}</div>
<div class="line"><a name="l00860"></a><span class="lineno">  860</span>&#160;</div>
<div class="line"><a name="l00861"></a><span class="lineno">  861</span>&#160;uint64_t ProductQuantizer::PQDecoder8::decode() {</div>
<div class="line"><a name="l00862"></a><span class="lineno">  862</span>&#160;  <span class="keywordflow">return</span> (uint64_t)(*code++);</div>
<div class="line"><a name="l00863"></a><span class="lineno">  863</span>&#160;}</div>
<div class="line"><a name="l00864"></a><span class="lineno">  864</span>&#160;</div>
<div class="line"><a name="l00865"></a><span class="lineno">  865</span>&#160;</div>
<div class="line"><a name="l00866"></a><span class="lineno">  866</span>&#160;ProductQuantizer::PQDecoder16::PQDecoder16(<span class="keyword">const</span> uint8_t *code, <span class="keywordtype">int</span> nbits)</div>
<div class="line"><a name="l00867"></a><span class="lineno">  867</span>&#160;    : code((uint16_t *)code) {</div>
<div class="line"><a name="l00868"></a><span class="lineno">  868</span>&#160;  assert(16 == nbits);</div>
<div class="line"><a name="l00869"></a><span class="lineno">  869</span>&#160;}</div>
<div class="line"><a name="l00870"></a><span class="lineno">  870</span>&#160;</div>
<div class="line"><a name="l00871"></a><span class="lineno">  871</span>&#160;uint64_t ProductQuantizer::PQDecoder16::decode() {</div>
<div class="line"><a name="l00872"></a><span class="lineno">  872</span>&#160;  <span class="keywordflow">return</span> (uint64_t)(*code++);</div>
<div class="line"><a name="l00873"></a><span class="lineno">  873</span>&#160;}</div>
<div class="line"><a name="l00874"></a><span class="lineno">  874</span>&#160;</div>
<div class="line"><a name="l00875"></a><span class="lineno">  875</span>&#160;</div>
<div class="line"><a name="l00876"></a><span class="lineno">  876</span>&#160;}  <span class="comment">// namespace faiss</span></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_ad291f113c6d44a634ddc1972f9a3c775"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775">faiss::ProductQuantizer::set_params</a></div><div class="ttdeci">void set_params(const float *centroids, int m)</div><div class="ttdoc">Define the centroids for subquantizer m. </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00198">ProductQuantizer.cpp:198</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35a6b330bc2cfa02a402d002d657f214931"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a6b330bc2cfa02a402d002d657f214931">faiss::ProductQuantizer::Train_hypercube_pca</a></div><div class="ttdoc">intialize centroids with nbits-D hypercube </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00044">ProductQuantizer.h:44</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_ac920fea11f02e8407d12cc99a09f5ea5"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">faiss::ProductQuantizer::nbits</a></div><div class="ttdeci">size_t nbits</div><div class="ttdoc">number of bits per quantization index </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00029">ProductQuantizer.h:29</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a7afbf9d96276f021981e99f064254208"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208">faiss::ProductQuantizer::decode</a></div><div class="ttdeci">void decode(const uint8_t *code, float *x) const </div><div class="ttdoc">decode a vector from a given code (or n vectors if third argument) </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00380">ProductQuantizer.cpp:380</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a849361f5f0ab0aba8d419c86f2594191"><div class="ttname"><a href="structfaiss_1_1Index.html#a849361f5f0ab0aba8d419c86f2594191">faiss::Index::reset</a></div><div class="ttdeci">virtual void reset()=0</div><div class="ttdoc">removes all elements from the database. </div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35ac8040c8792a014a2ea7188583575013e"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35ac8040c8792a014a2ea7188583575013e">faiss::ProductQuantizer::Train_hypercube</a></div><div class="ttdoc">intialize centroids with nbits-D hypercube </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00043">ProductQuantizer.h:43</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a8bc5d8d1cd0dd7b34b3c98a9f76b4a9c"><div class="ttname"><a href="structfaiss_1_1Index.html#a8bc5d8d1cd0dd7b34b3c98a9f76b4a9c">faiss::Index::assign</a></div><div class="ttdeci">void assign(idx_t n, const float *x, idx_t *labels, idx_t k=1)</div><div class="ttdef"><b>Definition:</b> <a href="Index_8cpp_source.html#l00034">Index.cpp:34</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_ab3067f333b26811537a8519fb08292ce"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#ab3067f333b26811537a8519fb08292ce">faiss::ProductQuantizer::set_derived_values</a></div><div class="ttdeci">void set_derived_values()</div><div class="ttdoc">compute derived values when d, M and nbits have been set </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00187">ProductQuantizer.cpp:187</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a6bd65fb4407452f73acb7242931d09e4"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">faiss::ProductQuantizer::sdc_table</a></div><div class="ttdeci">std::vector&lt; float &gt; sdc_table</div><div class="ttdoc">Symmetric Distance Table. </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00165">ProductQuantizer.h:165</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35aa1aefc6c08f0ca974de9f59d9557aa0d"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35aa1aefc6c08f0ca974de9f59d9557aa0d">faiss::ProductQuantizer::Train_shared</a></div><div class="ttdoc">share dictionary accross PQ segments </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00042">ProductQuantizer.h:42</a></div></div>
<div class="ttc" id="structfaiss_1_1ScopeDeleter_html"><div class="ttname"><a href="structfaiss_1_1ScopeDeleter.html">faiss::ScopeDeleter</a></div><div class="ttdef"><b>Definition:</b> <a href="FaissException_8h_source.html#l00045">FaissException.h:45</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a467b451ca203544e42c250e4be65b983"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">faiss::ProductQuantizer::dsub</a></div><div class="ttdeci">size_t dsub</div><div class="ttdoc">dimensionality of each subvector </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00032">ProductQuantizer.h:32</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3521b9a36c28219fd6180cc7a9ce8207"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207">faiss::ProductQuantizer::compute_distance_tables</a></div><div class="ttdeci">void compute_distance_tables(size_t nx, const float *x, float *dis_tables) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00546">ProductQuantizer.cpp:546</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_1_1PQDecoderGeneric_html"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer_1_1PQDecoderGeneric.html">faiss::ProductQuantizer::PQDecoderGeneric</a></div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00209">ProductQuantizer.h:209</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a95060fedd7c09eb20e968fd2fdb4b316"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a95060fedd7c09eb20e968fd2fdb4b316">faiss::ProductQuantizer::compute_code_from_distance_table</a></div><div class="ttdeci">void compute_code_from_distance_table(const float *tab, uint8_t *code) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00406">ProductQuantizer.cpp:406</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_ae5a340ee5a4b1d35a565b167de2a2ef1"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#ae5a340ee5a4b1d35a565b167de2a2ef1">faiss::ProductQuantizer::compute_codes</a></div><div class="ttdeci">void compute_codes(const float *x, uint8_t *codes, size_t n) const </div><div class="ttdoc">same as compute_code for several vectors </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00482">ProductQuantizer.cpp:482</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a2a002388d2c081c2dbab8508dcefe73d"><div class="ttname"><a href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">faiss::Index::d</a></div><div class="ttdeci">int d</div><div class="ttdoc">vector dimension </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00066">Index.h:66</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a36361f41bcd2fa698f3c39eb7111ed09"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a36361f41bcd2fa698f3c39eb7111ed09">faiss::ProductQuantizer::compute_distance_table</a></div><div class="ttdeci">void compute_distance_table(const float *x, float *dis_table) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00517">ProductQuantizer.cpp:517</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a1ae7892a15b9f6809a3ba1a123a7831b"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a1ae7892a15b9f6809a3ba1a123a7831b">faiss::ProductQuantizer::search</a></div><div class="ttdeci">void search(const float *x, size_t nx, const uint8_t *codes, const size_t ncodes, float_maxheap_array_t *res, bool init_finalize_heap=true) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00659">ProductQuantizer.cpp:659</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_aa61330eadb84772b71018b093773a5f9"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">faiss::ProductQuantizer::code_size</a></div><div class="ttdeci">size_t code_size</div><div class="ttdoc">byte per indexed vector </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00033">ProductQuantizer.h:33</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a1b5e9ac70adbce0897dd6c8276ad96f2"><div class="ttname"><a href="structfaiss_1_1Index.html#a1b5e9ac70adbce0897dd6c8276ad96f2">faiss::Index::add</a></div><div class="ttdeci">virtual void add(idx_t n, const float *x)=0</div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a62def246cfef670f2973fdf4af1414e1"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">faiss::ProductQuantizer::assign_index</a></div><div class="ttdeci">Index * assign_index</div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00052">ProductQuantizer.h:52</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_1_1PQEncoderGeneric_html_a91b56a2563f5c58bb9492272cacf42f3"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer_1_1PQEncoderGeneric.html#a91b56a2563f5c58bb9492272cacf42f3">faiss::ProductQuantizer::PQEncoderGeneric::nbits</a></div><div class="ttdeci">const int nbits</div><div class="ttdoc">number of bits per subquantizer index </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00180">ProductQuantizer.h:180</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a0feee45e4151547b7a0444c14bad398f"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">faiss::ProductQuantizer::ksub</a></div><div class="ttdeci">size_t ksub</div><div class="ttdoc">number of centroids for each subquantizer </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00034">ProductQuantizer.h:34</a></div></div>
<div class="ttc" id="structfaiss_1_1HeapArray_html"><div class="ttname"><a href="structfaiss_1_1HeapArray.html">faiss::HeapArray</a></div><div class="ttdef"><b>Definition:</b> <a href="Heap_8h_source.html#l00349">Heap.h:349</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a66be226806ca2abcaaf1653cdc690aa6"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a66be226806ca2abcaaf1653cdc690aa6">faiss::ProductQuantizer::search_ip</a></div><div class="ttdeci">void search_ip(const float *x, size_t nx, const uint8_t *codes, const size_t ncodes, float_minheap_array_t *res, bool init_finalize_heap=true) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00674">ProductQuantizer.cpp:674</a></div></div>
<div class="ttc" id="namespacefaiss_html_a3d9c7db82d43c1f0ab1d28b92bc9fe57"><div class="ttname"><a href="namespacefaiss.html#a3d9c7db82d43c1f0ab1d28b92bc9fe57">faiss::pairwise_L2sqr</a></div><div class="ttdeci">void pairwise_L2sqr(long d, long nq, const float *xq, long nb, const float *xb, float *dis, long ldq, long ldb, long ldd)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01021">utils.cpp:1021</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a08b130e3a21f2699a4e3bbec121fb838"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a08b130e3a21f2699a4e3bbec121fb838">faiss::ProductQuantizer::compute_code</a></div><div class="ttdeci">void compute_code(const float *x, uint8_t *code) const </div><div class="ttdoc">Quantize one vector with the product quantizer. </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00354">ProductQuantizer.cpp:354</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35a4960d143d2aa49cf92028cf3470c47a0"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a4960d143d2aa49cf92028cf3470c47a0">faiss::ProductQuantizer::Train_hot_start</a></div><div class="ttdoc">the centroids are already initialized </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00041">ProductQuantizer.h:41</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_af265acf5aa1bcda60898002287e6a3d6"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#af265acf5aa1bcda60898002287e6a3d6">faiss::ProductQuantizer::cp</a></div><div class="ttdeci">ClusteringParameters cp</div><div class="ttdoc">parameters used during clustering </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00048">ProductQuantizer.h:48</a></div></div>
<div class="ttc" id="structfaiss_1_1HeapArray_html_aad477a3907c3496159eaf4b375be4432"><div class="ttname"><a href="structfaiss_1_1HeapArray.html#aad477a3907c3496159eaf4b375be4432">faiss::HeapArray::nh</a></div><div class="ttdeci">size_t nh</div><div class="ttdoc">number of heaps </div><div class="ttdef"><b>Definition:</b> <a href="Heap_8h_source.html#l00353">Heap.h:353</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a83600e328893ce5f41fe459f5a3acf41"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">faiss::ProductQuantizer::M</a></div><div class="ttdeci">size_t M</div><div class="ttdoc">number of subquantizers </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00028">ProductQuantizer.h:28</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_1_1PQEncoderGeneric_html"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer_1_1PQEncoderGeneric.html">faiss::ProductQuantizer::PQEncoderGeneric</a></div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00177">ProductQuantizer.h:177</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_aecd05d180799f3956065b0c5c54fd406"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#aecd05d180799f3956065b0c5c54fd406">faiss::ProductQuantizer::compute_codes_with_assign_index</a></div><div class="ttdeci">void compute_codes_with_assign_index(const float *x, uint8_t *codes, size_t n)</div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00427">ProductQuantizer.cpp:427</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html">faiss::ProductQuantizer</a></div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00023">ProductQuantizer.h:23</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a4f0f33c011dffe633a1748a48a082c22"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">faiss::ProductQuantizer::get_centroids</a></div><div class="ttdeci">float * get_centroids(size_t m, size_t i)</div><div class="ttdoc">return the centroids associated with subvector m </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00058">ProductQuantizer.h:58</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a567cd512438f9e3404d9339a232d7695"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">faiss::ProductQuantizer::d</a></div><div class="ttdeci">size_t d</div><div class="ttdoc">size of the input vectors </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00027">ProductQuantizer.h:27</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a1e4056fa3938ed8c9fe701e90d94ad95"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a1e4056fa3938ed8c9fe701e90d94ad95">faiss::ProductQuantizer::verbose</a></div><div class="ttdeci">bool verbose</div><div class="ttdoc">verbose during training? </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00035">ProductQuantizer.h:35</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_aab1109a29ba0544358e274d727b23cae"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#aab1109a29ba0544358e274d727b23cae">faiss::ProductQuantizer::centroids</a></div><div class="ttdeci">std::vector&lt; float &gt; centroids</div><div class="ttdoc">Centroid table, size M * ksub * dsub. </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00055">ProductQuantizer.h:55</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35">faiss::ProductQuantizer::train_type_t</a></div><div class="ttdeci">train_type_t</div><div class="ttdoc">initialization </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00039">ProductQuantizer.h:39</a></div></div>
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